![]() ![]() If the position of the mirrors changes, the radio fingerprint also changes. These special mirrors are able to reflect the radio waves in the same way that an optical mirror ideally reflects light at visible wavelengths. ![]() “That would be like someone sticking a photo in front of a surveillance camera,” illustrates Johannes Tobisch.įor this reason, a setup with 20 rotating metallic mirrors is initially installed in the room that is to be monitored. It’s therefore necessary to prevent State B from recording the radio fingerprint and sending the recording instead of a just-measured signal. However, this method can only work if state B measures the radio fingerprint at precisely the time when state A requests it. Major changes, such as the removal of a stored nuclear warhead, can thus be reliably detected. ![]() The recorded signal is characteristic: if the objects were moved only minimally, this would noticeably change the radio fingerprint. ![]() The other antenna records the reflected signal. One of the antennas emits a radio signal that is reflected off the walls and objects in the room. “Our system uses two antennas to record a radio fingerprint of the room,” explains Dr. The system design was developed by a mixed team consisting of scientists from the Max Planck Institute for Security and Privacy in Bochum, Ruhr University Bochum, the School of Public and International Affairs at Princeton University, the University of Connecticut, Harvard University, PHYSEC GmbH, and Technische Universität Berlin. those ready for use, but rather to ensure that the far greater proportion of inactive warheads remain inactive. The primary goal is not necessarily to monitor the active warheads, i.e. An article that has now appeared in the scientific journal "Nature Communications" describes how State A can ensure that there are no changes in State B's nuclear weapons stockpile – and how this is possible without permanent on-site monitoring. ![]()
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